WEICON WEICONLOCK AN 302-77 Anaerobic Thread Sealant

WEICON WEICONLOCK AN 302-77 Anaerobic Thread Sealant is an anaerobic industrial adhesive solution designed to provide sealing in large threaded parts and flange connections. Its red color and fluorescent traceability make it easier to visually control the applied bead. Thanks to its high-strength character, it helps reduce the tendency to loosen under vibration and impact. Especially on coarse or wide thread profiles, its consistency supports controlled application without running, offering a practical alternative for maintenance and assembly processes.

Technical structure and operating principle of AN 302-77

This product works as an anaerobic, resin-based industrial adhesive that cures in narrow gaps between metal surfaces once contact with air is cut off. By filling thread voids, it limits micro-movements and helps close capillary leak paths. It is focused on forming a continuous sealing line on large threaded connections and flange surfaces. In one sentence: the manufacturer is WEICON GmbH & Co. KG, and the origin is Germany.

Performance values and durability approach

It is specified for use on threaded connections up to M36 and supports tolerance management with a maximum gap-bridging capability of 0.25 mm. Its viscosity is given as 6,000 mPa·s; this helps reduce running on the threads and supports controlled application. Breakaway torque is stated as 30–40 Nm and prevailing torque as 10–15 Nm, so the joint is expected to be planned as “difficult to remove.” Shear strength is reported as 10–20 N/mm² according to DIN 54452, targeting a high-strength class. Temperature resistance is defined as -60 °C to +150 °C, which aligns with typical operating conditions in many installation and process lines.

Curing time and process planning

Handling strength develops within 40–60 minutes, and full strength is expected to develop within 6–12 hours. Therefore, controlling the loading plan in the first hours after assembly helps keep joint performance stable. In lines requiring serial production or repeatable dosing, using dosing equipment strengthens application standardization. This approach supports consistent results in anaerobic sealing applications based on industrial adhesives.

Application method, compatible systems, and advantages

Degreasing and cleaning the surfaces before application directly affect the expected sealing and locking performance. The material is applied to the thread in circular movements using the dispensing tip; then the connection is tightened to the desired alignment. For flange use, a continuous bead is applied to one flange surface and the parts are assembled and tightened quickly. Not allowing the dispensing tip to contact metal directly and not returning product that has contacted metal back into the bottle are critical practices to prevent premature curing inside the container.

Storage and standards compatibility

It is stated to have a storage stability of at least 24 months at room temperature in its unopened original packaging. Keeping it away from heat sources and direct sunlight helps maintain product stability. The ISSA 53.402.27 and IMPA 450832 codes provide references that can simplify product classification in certain industrial supply and maintenance processes. With these features, the product stands out as a high-strength industrial adhesive option for applications where sealing is expected on large threaded parts and flange connections.